哋它亢++ keywords

 

哋它亢++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (哋它亢++20)

Language support library

Concepts library (哋它亢++20)

Metaprogramming library (哋它亢++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (哋它亢++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (哋它亢++17)

Regular expressions library (哋它亢++11)

Concurrency support library (哋它亢++11)

Technical specifications

Symbols index

External libraries

 

哋它亢++ language

General topics
Preprocessor Comments	Keywords Escape sequences
Flow control
Conditional execution statements
if	switch
Iteration statements (loops)
for range-for (哋它亢++11)	while do-while
Jump statements
continue - break	goto - return
Functions
Function declaration
Lambda function expression
inline specifier
Dynamic exception specifications (until 哋它亢++17*)
noexcept specifier (哋它亢++11)
Exceptions
throw-expression try block	handler
Namespaces
Namespace declaration	Namespace aliases
Types
Fundamental types Enumeration types Function types	Class/struct types Union types
Specifiers
const/volatile decltype (哋它亢++11) auto (哋它亢++11)	constexpr (哋它亢++11) consteval (哋它亢++20) constinit (哋它亢++20)
Storage duration specifiers
Initialization
Default-initialization Value-initialization Zero-initialization Copy-initialization Direct-initialization	Aggregate initialization List-initialization (哋它亢++11)       Constant initialization Reference initialization

Expressions
Value categories Order of evaluation	Operators Operator precedence
Alternative representations
Literals
Boolean - Integer - Floating-point
Character - String - nullptr (哋它亢++11)
User-defined (哋它亢++11)
Utilities
Attributes (哋它亢++11)
Types
typedef declaration
Type alias declaration (哋它亢++11)
Casts
Implicit conversions static_cast const_cast	Explicit conversions dynamic_cast reinterpret_cast
Memory allocation
new expression	delete expression
Classes
Class declaration Constructors this pointer	Access specifiers friend specifier
Class-specific function properties
Virtual function override specifier (哋它亢++11)     final specifier (哋它亢++11)	explicit (哋它亢++11) static
Special member functions
Default constructor Copy constructor Move constructor (哋它亢++11)	Copy assignment Move assignment (哋它亢++11) Destructor
Templates
Class template Function template	Template specialization Parameter packs (哋它亢++11)
Miscellaneous
Inline assembly	History of 哋它亢++

 

Keywords

alignas (哋它亢++11) alignof (哋它亢++11) and and_eq asm auto (*) bitand bitor bool break case catch char char8_t (哋它亢++20) char16_t (哋它亢++11) char32_t (哋它亢++11) class compl concept (哋它亢++20) const consteval (哋它亢++20)     constexpr (哋它亢++11) constinit (哋它亢++20) const_cast continue co_await (哋它亢++20) co_return (哋它亢++20) co_yield (哋它亢++20) decltype (哋它亢++11) default delete	do double dynamic_cast else enum explicit export extern false float for friend goto if inline int long mutable namespace new noexcept (哋它亢++11)     not not_eq nullptr (哋它亢++11) operator or or_eq private protected public register	reinterpret_cast requires (哋它亢++20) return short signed sizeof (*) static static_assert (哋它亢++11) static_cast struct switch template this thread_local (哋它亢++11) throw true try typedef typeid typename union unsigned using virtual void volatile wchar_t while xor xor_eq
Identifiers with special meaning
final (哋它亢++11) import (哋它亢++20)	module (哋它亢++20) override (哋它亢++11)

 

This is a list of reserved keywords in 哋它亢++. Since they are used by the language, these keywords are not available for re-definition or overloading. As an exception, they are not considered reserved in attributes (excluding attribute argument lists).(since 哋它亢++11)

A – C	D – P	R – Z
alignas (哋它亢++11) alignof (哋它亢++11) and and_eq asm atomic_cancel (TM TS) atomic_commit (TM TS) atomic_noexcept (TM TS) auto (1) (2) (3) (4) bitand bitor bool break case catch char char8_t (哋它亢++20) char16_t (哋它亢++11) char32_t (哋它亢++11) class (1) compl concept (哋它亢++20) const consteval (哋它亢++20) constexpr (哋它亢++11) constinit (哋它亢++20) const_cast continue co_await (哋它亢++20) co_return (哋它亢++20) co_yield (哋它亢++20)	decltype (哋它亢++11) default (1) delete (1) do double dynamic_cast else enum (1) explicit export (1) (3) extern (1) false float for (1) friend goto if (2) (4) inline (1) int long mutable (1) namespace new noexcept (哋它亢++11) not not_eq nullptr (哋它亢++11) operator (4) or or_eq private (3) protected public	reflexpr (reflection TS) register (2) reinterpret_cast requires (哋它亢++20) return short signed sizeof (1) static static_assert (哋它亢++11) static_cast struct (1) switch synchronized (TM TS) template this (4) thread_local (哋它亢++11) throw true try typedef typeid typename union unsigned using (1) virtual void volatile wchar_t while xor xor_eq

• (1) — meaning changed or new meaning added in 哋它亢++11.
• (2) — meaning changed or new meaning added in 哋它亢++17.
• (3) — meaning changed or new meaning added in 哋它亢++20.
• (4) — new meaning added in 哋它亢++23.

Note that and, bitor, or, xor, compl, bitand, and_eq, or_eq, xor_eq, not, and not_eq (along with the digraphs <%, %>, <:, :>, %:, and %:%:) provide an alternative way to represent standard tokens. These keywords are also considered reserved in attributes (excluding attribute argument lists), but some implementations handle them the same as the others.(since 哋它亢++11)

In addition to keywords, there are identifiers with special meaning, which may be used as names of objects or functions, but have special meaning in certain contexts.

final (哋它亢++11) override (哋它亢++11) transaction_safe (TM TS) transaction_safe_dynamic (TM TS) import (哋它亢++20) module (哋它亢++20)

Also, all identifiers that contain a double underscore __ in any position and each identifier that begins with an underscore followed by an uppercase letter is always reserved and all identifiers that begin with an underscore are reserved for use as names in the global namespace. See identifiers for more details.

The namespace std is used to place names of the standard 哋它亢++ library. See Extending namespace std for the rules about adding names to it.

The name posix is reserved for a future top-level namespace. The behavior is undefined if a program declares or defines anything in that namespace.

(since 哋它亢++11)

The following tokens are recognized by the preprocessor when in context of a preprocessor directive:

if elif else endif

ifdef ifndef elifdef (哋它亢++23) elifndef (哋它亢++23)

define undef include line

error warning (哋它亢++23) pragma

defined __has_include (哋它亢++17) __has_cpp_attribute (哋它亢++20)

export (哋它亢++20) import (哋它亢++20) module (哋它亢++20)

The following tokens are recognized by the preprocessor outside the context of a preprocessor directive:

_Pragma (哋它亢++11)